[gdm] display: Don't strdup unnecessarily

[Jasper St. Pierre <jstpierre src gnome org>]

commit 0ac1718e22cd5cfc34df209a6300d9bd73f2015f
Author: Jasper St. Pierre <jstpierre mecheye net>
Date:   Fri Feb 14 21:48:50 2014 -0500

    display: Don't strdup unnecessarily
    
    We can simply return a const char * here.

 daemon/gdm-display.c |    4 ++--
 daemon/gdm-display.h |    2 +-
 daemon/gdm-manager.c |   10 ++--------
 3 files changed, 5 insertions(+), 11 deletions(-)
---
diff --git a/daemon/gdm-display.c b/daemon/gdm-display.c
index 67ebac8..3251bc3 100644
--- a/daemon/gdm-display.c
+++ b/daemon/gdm-display.c
@@ -134,10 +134,10 @@ gdm_display_get_status (GdmDisplay *display)
         return display->priv->status;
 }
 
-char *
+const char *
 gdm_display_get_session_id (GdmDisplay *display)
 {
-        return g_strdup (display->priv->session_id);
+        return display->priv->session_id;
 }
 
 static GdmDisplayAccessFile *
diff --git a/daemon/gdm-display.h b/daemon/gdm-display.h
index bfba143..739be7d 100644
--- a/daemon/gdm-display.h
+++ b/daemon/gdm-display.h
@@ -102,7 +102,7 @@ char *              gdm_display_open_reauthentication_channel_sync        (GdmDi
                                                                            uid_t          uid_of_caller,
                                                                            GCancellable  *cancellable,
                                                                            GError       **error);
-char *              gdm_display_get_session_id                 (GdmDisplay *display);
+const char *        gdm_display_get_session_id                 (GdmDisplay *display);
 gboolean            gdm_display_create_authority               (GdmDisplay *display);
 gboolean            gdm_display_prepare                        (GdmDisplay *display);
 gboolean            gdm_display_manage                         (GdmDisplay *display);
diff --git a/daemon/gdm-manager.c b/daemon/gdm-manager.c
index be2c267..b1c61c2 100644
--- a/daemon/gdm-manager.c
+++ b/daemon/gdm-manager.c
@@ -260,16 +260,10 @@ lookup_by_session_id (const char *id,
                       gpointer    user_data)
 {
         const char *looking_for = user_data;
-        char *current;
-        gboolean res;
+        const char *current;
 
         current = gdm_display_get_session_id (display);
-
-        res = g_strcmp0 (current, looking_for) == 0;
-
-        g_free (current);
-
-        return res;
+        return g_strcmp0 (current, looking_for) == 0;
 }
 
 static GdmDisplay *